All airports and larger rail stations have shops run by the Swiss telephone providers Swisscom, Sunrise and Salt where you can buy SIM cards. Kiosks, post offices or grocery stores also sell prepaid SIM cards. To find out which prepaid option is suitable for you, you're best to consult a specialist in one of the aforementioned telephone providers' shops. Many hotels and restaurants allow their customers to access the WLAN free of charge. You can also access the internet free of charge at major Swiss rail stations and airports.